17 matter for statistical accounting? measurable dimension?No, can only be experienced at individual level.Collective unhappiness is easy to chart, but happiness won’t aggregate: the greatest good of the greatest number does not necessarily amount to it.not visible to direct scrutiny; the more you try to focus on it, the more vague it becomes.

18 just as happy as we make up our minds to beExtent of happiness?just as happy as we make up our minds to be

19 Still not happy when…chief sources of human unhappiness – large-scale social injustice, famine, plague and other diseases, the near- certainty of an early death – have largely been removed from our lives?

20 At last… buying things doesn't make anyone happy.losing our self-preoccupation is important,focus on something else.People dedicated to something other than themselves- helping family and friends, or a political cause, or others less fortunate than they- are the most happiest people.